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New Latin, from Ancient Greek word for a little cap.


pilidium (plural pilidia)

  1. (zoology) The free-swimming, hat-shaped larva of certain nemertean worms. It has no resemblance to its parent, and the young worm develops in its interior.

Related terms[edit]

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for pilidium in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)



pilidium m (invariable)

  1. (zoology) pelagic larva of certain nemertean worms